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        <h3 class="post-title"><span>vue实现文字滚动效果</span></h3>
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    <p class="post-meta text-center">
        Calos 发表于
        <time datetime="2019-05-19T16:00:00.000Z">2019-05-20</time>
    </p>
    <div class="post-content">
        <h2 id="一、实现步骤"><a href="#一、实现步骤" class="headerlink" title="一、实现步骤"></a>一、实现步骤</h2><ol>
<li><p>给按钮【浪起来】绑定开始事件，给按钮【稳住】绑定停止事件。</p>
</li>
<li><p>开始事件中，获取要现实的字符串，使用 <em>substring()</em> 对字符串进行截取操作，每次截取字符串的第一个文字，把这个字放到字符串的后面，实现文字滚动效果。</p>
</li>
<li><p>添加定时器，实现字符串的自动截取和拼接</p>
</li>
<li><p>停止事件中，清除掉定时器</p>
</li>
<li><p>可以而给文字加上鼠标覆盖和离开事件，鼠标放上去的时候，文字停止滚动，鼠标离开继续滚动。</p>
</li>
<li><p>增加字体颜色的改变</p>
<p><strong>PS：注意 <font color="#FF8C00">this</font> 的作用域</strong></p>
<p><img src="\blog\img\vue\3.gif" alt></p>
</li>
</ol>
<h2 id="二、代码实现"><a href="#二、代码实现" class="headerlink" title="二、代码实现"></a>二、代码实现</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">title</span>&gt;</span><span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">script</span> <span class="attr">type</span>=<span class="string">"text/javascript"</span> <span class="attr">src</span>=<span class="string">"../vue-2.6.10.js"</span>&gt;</span><span class="undefined"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"app"</span>&gt;</span></span><br><span class="line">            <span class="comment">&lt;!-- 绑定鼠标放上去和离开的事件 --&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">p</span> @<span class="attr">mouseover</span>=<span class="string">"stop"</span> @<span class="attr">mouseleave</span>=<span class="string">"start"</span> <span class="attr">:style</span>=<span class="string">"&#123;'color':color&#125;"</span>&gt;</span>&#123;&#123;message&#125;&#125;<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">hr</span> /&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"button"</span> <span class="attr">value</span>=<span class="string">"浪起来"</span> @<span class="attr">click</span>=<span class="string">"start"</span> /&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"button"</span> <span class="attr">value</span>=<span class="string">"稳住"</span> @<span class="attr">click</span>=<span class="string">"stop()"</span> /&gt;</span></span><br><span class="line">		<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">script</span>&gt;</span><span class="undefined"></span></span><br><span class="line"><span class="javascript">			<span class="keyword">var</span> test = <span class="keyword">new</span> Vue(&#123;</span></span><br><span class="line"><span class="javascript">				el: <span class="string">"#app"</span>,</span></span><br><span class="line"><span class="undefined">				data: &#123;</span></span><br><span class="line"><span class="javascript">					message: <span class="string">"稳住！！我们能赢~~~"</span>,</span></span><br><span class="line"><span class="javascript">					interval: <span class="literal">null</span>,</span></span><br><span class="line"><span class="javascript">					color:<span class="string">'red'</span>,</span></span><br><span class="line"><span class="javascript">					colorList:[<span class="string">'chartreuse'</span>,<span class="string">'red'</span>,<span class="string">'coral'</span>,<span class="string">'chocolate'</span>],</span></span><br><span class="line"><span class="undefined">					index:0</span></span><br><span class="line"><span class="undefined">				&#125;,</span></span><br><span class="line"><span class="undefined">				methods: &#123;</span></span><br><span class="line"><span class="javascript">					start: <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">                        <span class="comment">//如果为空则添加定时事件，否则不添加，防止越点越快，停不下来</span></span></span><br><span class="line"><span class="javascript">						<span class="keyword">if</span> (<span class="keyword">this</span>.interval == <span class="literal">null</span>) &#123;</span></span><br><span class="line"><span class="javascript">							<span class="keyword">this</span>.interval = setInterval(<span class="function"><span class="params">()</span> =&gt;</span> &#123;</span></span><br><span class="line"><span class="javascript">                                   <span class="comment">//截取首个汉字和后面的汉字,注意this的作用域</span></span></span><br><span class="line"><span class="javascript">								<span class="keyword">var</span> beginStr = <span class="keyword">this</span>.message.substring(<span class="number">0</span>, <span class="number">1</span>);</span></span><br><span class="line"><span class="javascript">								<span class="keyword">var</span> endStr = <span class="keyword">this</span>.message.substring(<span class="number">1</span>);</span></span><br><span class="line"><span class="javascript">								<span class="keyword">this</span>.message = endStr + beginStr;</span></span><br><span class="line"><span class="javascript">								<span class="comment">//获取颜色数组的位置</span></span></span><br><span class="line"><span class="javascript">								<span class="keyword">this</span>.color = <span class="keyword">this</span>.colorList[<span class="keyword">this</span>.index];</span></span><br><span class="line"><span class="javascript">								<span class="keyword">this</span>.index++;</span></span><br><span class="line"><span class="javascript">                                	<span class="comment">//长度等于数组长度，更改初始位置为0</span></span></span><br><span class="line"><span class="javascript">								<span class="keyword">if</span> (<span class="keyword">this</span>.index==<span class="number">4</span>) &#123;</span></span><br><span class="line"><span class="javascript">									<span class="keyword">this</span>.index=<span class="number">0</span>;</span></span><br><span class="line"><span class="undefined">								&#125;</span></span><br><span class="line"><span class="undefined">							&#125;, 400)</span></span><br><span class="line"><span class="undefined">						&#125;</span></span><br><span class="line"><span class="undefined">					&#125;,</span></span><br><span class="line"><span class="javascript">					stop: <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">						clearInterval(<span class="keyword">this</span>.interval);</span></span><br><span class="line"><span class="javascript">						<span class="keyword">this</span>.interval = <span class="literal">null</span>;</span></span><br><span class="line"><span class="undefined">					&#125;</span></span><br><span class="line"><span class="undefined">				&#125;</span></span><br><span class="line"><span class="undefined">			&#125;)</span></span><br><span class="line"><span class="undefined">		</span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>

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